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By Root 1240 0

W at 25°C will supply substantially less in warmer temperatures, and the inside of your PC is usually 15°C warmer than the outside air. Sadly, many power supply makers—even those who make good power supplies—fudge this fact.

Chapter Review

Questions

1. What is the proper voltage for a U.S. electrical outlet?

A. 120 V

B. 60 V

C. 0 V

D. –120 V

2. What voltages does an ATX12V P1 connector provide for the motherboard?

A. 3.3 V, 5 V

B. 3.3 V, 12 V

C. 5 V, 12 V

D. 3.3 V, 5 V, 12 V

3. What sort of power connector does a floppy disk drive typically use?

A. Molex

B. Mini

C. Sub-mini

D. Micro

4. Joachim ordered a new power supply but was surprised when it arrived because it had an extra 4-wire connector. What is that connector?

A. P2 connector for plugging in auxiliary components

B. P3 connector for plugging in case fans

C. P4 connector for plugging into modern motherboards

D. Aux connector for plugging into a secondary power supply

5. What should you keep in mind when testing DC connectors?

A. DC has polarity. The red lead should always touch the hot wire; the black lead should touch a ground wire.

B. DC has polarity. The red lead should always touch the ground wire; the black lead should always touch the hot wire.

C. DC has no polarity, so you can touch the red lead to either hot or ground.

D. DC has no polarity, so you can touch the black lead to either hot or neutral but not ground.

6. What voltages should the two hot wires on a Molex connector read?

A. Red = 3.3 V; Yellow = 5 V

B. Red = 5 V; Yellow = 12 V

C. Red = 12 V; Yellow = 5 V

D. Red = 5 V; Yellow = 3.3 V

7. Why is it a good idea to ensure that the slot covers on your computer case are all covered?

A. To maintain good airflow inside your case.

B. To help keep dust and smoke out of your case.

C. Both A and B are correct reasons.

D. Trick question! Leaving a slot uncovered doesn’t hurt anything.

8. A PC’s power supply provides DC power in what standard configuration?

A. Two primary voltage rails, 12 volts and 5 volts, and an auxiliary 3.3 volt connector

B. Three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors

C. One primary DC voltage rail for 12-volt, 5-volt, and 3.3-volt connectors

D. One voltage rail with a 12-volt connector for the motherboard, a second voltage rail with a 12-volt connector for the CPU, and a third voltage rail for the 5-volt and 3.3-volt connectors

9. What feature of ATX systems prevents a user from turning off a system before the operating system’s been shut down?

A. Motherboard power connector

B. CMOS setup

C. Sleep mode

D. Soft power

10. How many pins does a SATA power connector have?

A. 6

B. 9

C. 12

D. 15

Answers

1. A. US outlets run at 120V.

2. D. An ATX12V power supply P1 connector provides 3.3, 5, and 12 volts to the motherboard.

3. B. Floppy drives commonly use a mini connector.

4. C. The P4 connector goes into the motherboard to support more power-hungry chips.

5. A. DC has polarity. The red lead should always touch the hot wire; the black lead should touch a ground wire.

6. B. A Molex connector’s red wires should be at 5 volts; the yellow wire should be at 12 volts.

7. C. Both A and B are correct reasons: Keeping the slots covered helps keep a good airflow in your case and keeps the dust and smoke away from all those sensitive internal components.

8. B. The standard PC power supply configuration has three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors.

9. D. The soft power feature of ATX systems prevents a user from turning off a system before the operating system’s been shut down.

10. D. SATA power connectors have 15 pins.

CHAPTER 11

Hard Drive Technologies

In this chapter, you will learn how to

Explain how hard drives work

Identify and explain the PATA and SATA hard drive interfaces

Identify and explain the SCSI hard drive interfaces

Describe how to protect data with RAID